Damper



J. MAYO;

(No Model.)

DAMPER.

No. 475,131. Patented May 17, 1892.

jUNITED STATES PATENT OFFICE.

JAMES MAYO, OF POTTSTOIVN, PENNSYLVANIA.

DAMPER.

SPECIFICATION forming part of Letters Patent No. 475,131, dated May 17,1892. Application filed September 12,1891. Serial No. 405,507. (Nomodel.)

T0 at whom it may concern:

Be it known that 1, JAMES MAYO, a citizenof the United States, and aresident of Pottstown, county of Montgomery, and State of Pennsylvania,have invented a certain new and usefulImprovement in Dampers, of whichthe following is a full, clear, and exact description.

The object of my invention is to provide means for automaticallyregulating theheat of stoves, furnaces, &c.. which shall besimple inconstruction and perfect in operation; and to this end niy'inventionconsists in the device constructed and arranged substantially ashereinafter specified.

In the drawings, Figure l is a vertical section through a portion ofstovepipe equipped with my device; Fig. 2, a similar section taken in aplane at right angles to that of Fig. 1, and Fig. 3 is a detail view ofthe pivot device I employ.

My device is to be placed in the draft pipe or line of the stove to beregulated, and without substantial variation in its structure in view ofcircumstances is adapted for use either in vertical, horizontal, orinclined sections of pipes or lines. I show it adapted for use in avertical section of Stovepipe; but with the explanation just made itwill be seen that to such arrangement my invention is not limited.

Referring to the drawings, A designates a pivoted damper of any suitablematerial and shape adapted to be vibrated to open and close the flue orpipe B, in which itris placed. It is pivoted in two upwardly-extendedarms or brackets C and 0, located at points diametrically opposite eachother in the pipe, by having the ends (Z and cl of a strip or piece ofsheet metal D,to which it is fastened and which project beyond itsedges, contained in openings c in said brackets. The openings 0 aretriangular or V-shaped, and the damper-pivots d are set on their edgestherein, so that there will be but slight friction to offer impedimentto an easy vibration of the damper. If preferred, the pivots or journalsd may be made integral with the damper instead of in the form of aseparate piece.

To cause the damper to be moved automatically, I provide at a point inthe pipe B above the same an opening .of suitable dimensions, over whichon the inside of the pipe is a flat or sheet metal piece or plate E,adapted to entirely cover it. Said piece at its lower end is attached toan obliquely and downwardly extending bar or rod F, which at about itslongitudinal center is attached to a thin strip or bar F of sheet metalthat extends horizontally across the pipe B and is supported upon thewalls thereof in pivot or journal arms or brackets O and O, similar tothose 0 of the damper. Said bar constitutes a pivot, upon which theplate E may move to and from the opening b, and it-extends in adirection parallel with the axis of the damper. At its lower end the rodor bar F is connected by a link Gr with the top edge of the damper, sothat vibrations or movements of the plate E will be imparted to thelatter.

The operation of the parts thus constructed is as follows, viz: With nofire in the stove the plate E (which I shall term the regulating-plate)covers the opeuingp in the pipe B, and the damper A, through itsconnection with the latter, is held open; but when a fire is made and inconsequence the air in the pipe or flue is rarefied and lightened, thesuperior weight or force of the external air upon the outside of theregulating-plate will move the same. inward and. close the damperproportionate to its inward movement, the parts having such relativearrangement that inward movement tends to close the damper, whileoutward movement opens it. In order to fix the temperature at which theregulating-plate shall operate, I project outwardly from the same an arm6, upon which is suspended a weight H to resist the inward tendency ofthe plate. Said weightis adjustable on the arm to vary its resistance.By the use of this weight the temperature at which the device shalloperate may be fixed. Preferably a counter-balance is attached to thelower end of the arm F, which causes the regulatingplate E to be themore easily tipped, the combined weight having slightly greater effectthan the downward pressure of the plate E, whereby the more exactbalancing is left to the weight.

It will be seen from the foregoing that the operation of my device isbased on the relation which may exist between the pressure of the heatedair in the-pipe or flue and the external. air, so: th at should theformer betlighter than the latter and to a degree to allow the weight Hto be overcome the regulating-plate will be moved inward and the damperclosed, while upon a cooling of the air in vthe pipe a reversemovement'will take place and-the damper opened. The peculiar form ofpivots employed enables the oscillating parts "t0 be very easily moved,as but little friction is created.

Having thus described my invention, .what,

I claim is The combination, with a stovepipemf'abar F, centrally pivotedtherein, the opposite ends of the said "bar I being n earopposite sidesof:

the pipe, a plate projecting upwardly from =thetupper end: of the bar,and closing an aperture in the pipe, means for normally holding the saidplate in the said position, a damper centrally pivoted on the said pipebelow the said bar, a connection between the lower end of thesaid-barand one side of the damper, and a counterpoise upon the said lower endof the bar, substantially as described.

In testimony whereof I have hereunto set my vhand-in the presence of twowitnesses.

JAMES MAYO.

1 WVitnessesz:

JOHN B. GUEST, WALACE BRADFORD.

